@Stick:
Women in kitchens don't _need_ can openers. When in the house of a lady that spent most of her life doing housework, you do NOT mess with her. Her word is law as long as you are in that house. And all those knives that seem to magically appear whenever she needs them for cooking? You can bet she knows how to use them. On anything. Including cans. Or you.

Seriously, don't mess with them. I've seen them fight off ninjas with ease. And she didn't even think of the ninjas as a threat. Just a mild annoyance. Like an insignificant insect. A clean one, because insects are smart enough not to risk going into the kitchen without washing their appendages.